-p(ə)rəs noun
Usage: capitalized
Etymology: New Latin, from Latin, adjective, viviparous
: a widely distributed genus (the type of the cosmopolitan family Viviparidae of the suborder Taenioglossa) of freshwater snails that have a turbinate operculate shell which is usually greenish and more or less banded with brown and that are born alive and with a well-developed shell